1th of 6 Questions.
Singleton Pattern
The Singleton pattern ensures a class has only one instance and provides a global point of access to it, useful for shared resources like configuration objects, logging services, and state management stores.
The Singleton pattern restricts a class to a single instance across the application. This is particularly useful for managing shared resources such as configuration settings, logging utilities, or application-wide state stores, where having multiple instances could lead to inconsistencies or excessive resource consumption. In JavaScript, this can be implemented simply using object literals with Object.freeze() to prevent modifications, or using classes with a static getInstance method[citation:7].
Vanilla JavaScript Implementation
React Implementation
Angular Implementation